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There were many ratios offered over the lifetime of the AMC 20. [1] Letter codes were stamped on the axle to indicate installed gears. AMC changed or reused letter codes during the axle's long life. There are other gear ratios available in the aftermarket.
Dana 35c is a newer version of Dana35. C stands for a Custom as the axle was delivered to the end user without axle brackets. The axle uses a C clip, which holds the axle shafts in the carrier. A centre pin locks the shafts in. Gear Ratio: 3.55 || 11:39 - 4.11 || 9:37 -
When in "4-Low" mode the front and rear axles are locked together and power is sent to all four-wheels through a 2.92:1 gear reduction in the power transfer unit; providing a crawl ratio of 56:1 for four cylinder Jeep Cherokees and a 47.8:1 crawl ratio for six-cylinder Cherokees. All Cherokees with this system have a raised ride height of one inch.
Dana 61 axle tag showing 3.73:1 ratio [1] The Dana 61 was made in semi-float and full-float axles for select 4×2 and 4x4 Ford 3 ⁄ 4-ton and 1 Ton Pickups and Vans from 1974 to 1987. A Dana 61 front axle was selectively used in Dodge 4×4 3 ⁄ 4-ton and 1 Ton pickups from 1987 to 1993. Although 3.07:1 and 3.31:1 gear sets are common for a ...
The Dana 44 rear axle first saw use in the 1940s and is still in use today. The Dana 44 has a GAWR up to 3,500 lb (1,600 kg) and is a semi-floating type, having one bearing on the end of the axle shaft which carries the weight of the vehicle on the axle and also allows axle rotation.
The Dana 70 axle only came with 5.13:1, 4.88,5.31 [citation needed] gear ratios and had a GAWR of [citation needed] these axles were rated at 7-9klbs as seen on 5500 door stickers. They differ greatly from previous Dana 70 front axles, some of the major differences being the use of 1550 Universal Joints and being a high pinion, reverse cut axle.
Neutral mode is intended for towing the vehicle. In 4-Lo, the front and rear axles are locked together through a 2.72 reduction gear ratio. The NV247 transfer case is mated to front and rear axles containing Jeep's Vari-Lok differentials. Vari-Lok differentials also use a gerotor to transfer torque between the wheels on either side of the axle.
Otherwise the Dana 20 offers the same drive modes as the Dana 18. Its low range has a ratio of 2.03:1. The Dana 20 is generally compatible with the "big hole" Dana 18. One exception is the version used with the THM400 in full-size Jeep trucks, which used a different spline number on the input gear. Applications: Jeep CJ; Jeep SJ